JP2016185853A - Conveying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conveying device that can suppress wall bodies constituting a conveying path and a conveying instrument from being abraded by suppressing speed of falling solid fuel.SOLUTION: A conveying device equipped with a conveying path 25 for conveying solid fuel to be charged into a combustion furnace 5 is configured to comprise a plurality of shelf boards 51 and 52 in the conveying path 25 into which the solid fuel falls. The plurality of shelf boards 51 and 52 are configured to have the first shelf board 51 disposed upward of the plurality of shelf boards and the second shelf board 52 disposed below the first shelf board 51, and the second shelf board 52 is disposed at a position which covers from below an opening part 42 adjacent to the first shelf board 51 when viewed from above.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a transport apparatus having a transport path for transporting solid fuel to be introduced into a combustion furnace.

  2. Description of the Related Art Conventionally, for example, in a fluidized bed combustion facility, waste (solid fuel) stored in a hopper is transported by a transport device and is put into a combustion furnace (see, for example, Patent Document 1). The facility described in Patent Document 1 is provided with a dropping portion that extends in the up-down direction and drops solid fuel in a transport path leading to the combustion furnace.

JP 2001-182920 A

  For example, when transporting solid fuel that is harder than the conventional solid fuel as the solid fuel, at the lower end of the dropping part, the solid fuel hits the wall body or the transport device that constitutes the transport path. There is a risk of wearing the conveyor equipment. Moreover, if wear-resistant materials are used in order to prevent wear of the walls and the conveying equipment that constitute the conveying path, the manufacturing cost of the conveying device may increase.

  An object of this invention is to provide the conveying apparatus which can suppress the abrasion of the wall body and conveyance apparatus which comprise a conveyance path | route, suppressing the speed of the solid fuel which falls.

  The present invention is a transport device having a transport path for transporting solid fuel to be introduced into a combustion furnace, comprising a plurality of shelf boards in a transport path where solid fuel falls, and the plurality of shelf boards are composed of a plurality of shelf boards. It has the 1st shelf board arranged above the shelf board, and the 2nd shelf board arranged below the 1st shelf board, and the 2nd shelf board was seen from the upper part In this case, the opening adjacent to the first shelf is disposed at a position covering the opening from below.

  In this transport device, the solid fuel that falls from above the first shelf is deposited on the first shelf. When the amount of solid fuel deposited on the first shelf exceeds a certain amount, a part of the solid fuel deposited on the first shelf falls downward from the opening adjacent to the first shelf. . In addition, when a certain amount of solid fuel is deposited on the first shelf, the solid fuel that has fallen from above hits the solid fuel deposited on the first shelf and then passes through the opening adjacent to the first shelf. Fall down. Similarly, in the transport device, the solid fuel that falls from above the second shelf is deposited on the second shelf. When the amount of the solid fuel deposited on the second shelf exceeds a certain amount, a part of the solid fuel deposited on the second shelf falls downward from the opening adjacent to the second shelf. . In addition, when a certain amount of solid fuel is deposited on the second shelf, the solid fuel dropped from above hits the solid fuel deposited on the second shelf, and then from the opening adjacent to the second shelf. Fall down.

  Since the solid fuel falling from above accumulates on the first shelf plate and / or the second shelf plate or falls downward after hitting the deposited solid fuel, the falling speed is reduced. Will be. For this reason, it is possible to suppress the wear of the wall body and the conveying device constituting the conveying path. Moreover, since the impact which a solid fuel receives is relieve | moderated because the fall speed of a solid fuel is decelerated, the failure | damage of a solid fuel is suppressed. Moreover, since solid fuel accumulates on the first shelf board and the second shelf board and cell flying is formed to cover the surfaces of the first shelf board and the second shelf board, it falls from above. The solid fuel is prevented from hitting the first shelf and the second shelf directly. Therefore, wear of the first shelf board and the second shelf board is suppressed. Moreover, since the falling solid fuel hits the solid fuel functioning as cell flying, the damage of the solid fuel itself can be suppressed.

  Moreover, the structure arrange | positioned in the position which covers the whole surface of an opening part from the downward direction may be sufficient as the 2nd shelf board when it sees from the upper direction. Thereby, since the 2nd shelf covers all the opening parts which adjoin the 1st shelf from the lower part, the solid fuel which falls from the upper part is the 1st shelf board and the 2nd shelf board It will hit at least one of these, and will be decelerated reliably. In other words, the solid fuel falls without hitting the first shelf board (or the solid fuel deposited on the first shelf board) or the second shelf board (or the solid fuel deposited on the second shelf board). Since this is prevented, the falling speed of the solid fuel can be surely reduced. For this reason, it is possible to reliably suppress the wear of the wall body and the conveying device constituting the conveying path.

  In addition, the conveying device may be configured such that the distance between the solid fuel deposited on the second shelf and the first shelf is equal to or greater than the opening width of the opening adjacent to the first shelf. . According to the transport device having this configuration, the opening width of the gap between the solid fuel deposited on the second shelf and the first shelf disposed above the first shelf is equal to the first shelf. Since it is more than the opening width of the opening part adjacent to a board, the opening width which a solid fuel can pass is ensured reliably. Therefore, the risk of clogging the solid fuel can be reduced and the solid fuel can be reliably passed.

  Further, the first shelf is provided with a weir that projects upward at the end on the opening side adjacent to the first shelf, and the second shelf is provided with the second shelf. A configuration in which a weir protruding upward is provided at an end portion on the adjacent opening side is also possible. According to this configuration, the solid fuel can be reliably deposited on the first shelf plate and the second shelf plate, and the slope of the deposited solid fuel can be stabilized. Thereby, the falling solid fuel can be applied to the slope of the deposited solid fuel at a suitable angle.

  ADVANTAGE OF THE INVENTION According to this invention, the speed | rate of the solid fuel which falls can suppress the wear of the wall body and conveyance apparatus which comprise a conveyance path | route. Moreover, according to the conveying apparatus of this invention, since the impact which the solid fuel which fell falls can be relieved, damage to a solid fuel can be suppressed.

It is the schematic which shows the fluidized bed combustion facility of one Embodiment of this invention. It is the schematic which shows the fuel supply equipment which throws solid fuel into the furnace in FIG. It is sectional drawing which shows the connection part of a solid fuel common 1st conveyance unit and a 2nd fuel chute. It is the IV-IV sectional view taken on the line of FIG. It is sectional drawing which shows the shelf installed in the 2nd fuel chute. It is the schematic which shows the modification of a 2nd fuel receiving conveyance part.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same part or an equivalent part, and the overlapping description is abbreviate | omitted.

  A fluidized bed combustion facility 1 shown in FIG. 1 includes a circulating fluidized bed boiler (combustion furnace) 2 into which solid fuel is charged, a fuel supply facility (conveying device) 3 that supplies the solid fuel to the circulating fluidized bed boiler 2, and And an exhaust gas treatment facility 4 for treating the exhaust gas discharged from the circulating fluidized bed boiler 2. Examples of the solid fuel to be introduced into the circulating fluidized bed boiler 2 include biomass, PKS (palm palm shell), coal, paper sludge, RPF (Refuse paper & Plastic Fuel), TDF (Tire Derived Fuel), EFB (Empty Fruit Bunches). Rice husk (rice husk). Other combustible materials may be used as the solid fuel. Biomass includes, for example, building waste materials. This embodiment demonstrates the case where biomass (woody) and PKS are used.

  The circulating fluidized bed boiler 2 has a furnace 5 that forms a fluidized bed and burns solid fuel. At the side of the furnace 5, there is provided a fuel inlet 5a for feeding solid fuel. The fuel supply facility 3 inputs solid fuel into the furnace 5 through the fuel input port 5a. Further, the furnace 5 is provided with a fluid medium supply port 5b for supplying a fluid medium.

  A gas outlet 5c for discharging exhaust gas generated by combustion is provided at the upper part of the furnace 5, and a cyclone 6 is connected to the gas outlet 5c. The cyclone 6 is called a separator, a cyclone classifier, or a cyclone separator, and functions as a solid-gas separator. The inlet 6 a of the cyclone 6 is connected to the gas outlet 5 c described above, and the outlet 6 b of the cyclone 6 is connected to the exhaust gas treatment facility 4 at the subsequent stage via the back path 7. A return line 8 called a downcomer extends downward from the bottom outlet 6 c of the cyclone 6, and the lower end of the return line 8 is connected to the furnace 5 through a lower side connection port 5 d of the furnace 5. .

  A plurality of air supply ports 5 e for supplying air into the furnace 5 are provided at the bottom of the furnace 5. Air is supplied into the furnace 5 through the air supply port 5e. In the furnace 5, the biomass supplied by the air supply port 5e causes the biomass, PKS and fluid medium to flow to form a fluidized bed, and the solid fuel burns.

  The exhaust gas generated in the furnace 5 is introduced into the cyclone 6 along with the fluid medium. Inside the cyclone 6, a swirling flow of exhaust gas is formed, and a fluid medium and a gas are separated by a centrifugal separation action by the swirling flow. The separated fluid medium is discharged from the bottom outlet 6 c of the cyclone 6, descends in the return line 8, and the fluid medium that has passed through the return line 8 is returned to the bottom of the furnace 5.

  The back path 7 is a duct for circulating exhaust gas. The back path 7 is provided with a heat recovery unit 9 for recovering the heat of the exhaust gas. The heat recovery unit 9 includes a heat transfer tube that is introduced into the back path 7 and arranged so as to cross the exhaust gas passage. The heat of the exhaust gas flowing through the back path 7 is transferred to and recovered by a fluid (for example, boiler feed water) flowing through the heat transfer pipe.

  The exhaust gas flows from the top to the bottom in the back path 7, is discharged from the bottom of the back path 7, and is introduced into the exhaust gas treatment facility 4. The exhaust gas treatment facility 4 removes fine particles such as fly ash accompanying the exhaust gas and performs a desulfurization process on the exhaust gas. The exhaust gas processed by the exhaust gas processing facility 4 is released from the chimney 10 to the atmosphere, for example.

  Further, a furnace wall tube is formed in the furnace 5. The furnace wall pipe has a boiler tube for circulating the boiler water, and a fin that extends from the boiler tube and connects adjacent boiler tubes. The boiler water flowing in the boiler tube is heated by heat transferred from the combustion in the furnace 5 to become steam. The fluid medium that flows in the furnace 5 functions as a heat transfer medium that transmits heat generated by the combustion to the furnace wall tube. The water vapor generated in the boiler tube is supplied to, for example, a power generation turbine and used for power generation. In addition, the use of the water vapor | steam generate | occur | produced with the boiler is not limited to electric power generation, You may use water vapor | steam for another use.

  Next, the fuel supply facility 3 will be described with reference to FIG. The fuel supply facility 3 is a transport device that collects and transports a plurality of types of solid fuel (biomass, PKS) and puts them into the furnace 5. The fuel supply facility 3 includes a first fuel receiving and conveying unit 11, a second fuel receiving and conveying unit 12, and a solid fuel common conveying unit 14.

  The first fuel receiving and transporting unit 11 receives, stores, and transports biomass that is one of a plurality of types of solid fuel. Biomass includes wood such as building waste. The first fuel receiving and conveying unit 11 includes a first fuel storage tank 16 and a first fuel conveying unit 17. The solid fuel received, stored, and transported by the first fuel receiving and transporting unit 11 is not limited to biomass, but may be other solid fuel. Further, the first fuel receiving and transporting unit 11 may receive, store, and transport a plurality of types of solid fuel.

  The first fuel storage tank 16 receives and stores biomass. A discharge port 16 a for discharging biomass stored in the first fuel storage tank 16 is provided at the bottom of the first fuel storage tank 16. Biomass discharged from the discharge port 16 a is introduced into the first fuel transfer unit 17.

  Further, a screw reclaimer 16b is provided at the bottom of the first fuel storage tank 16 for conveying the biomass accumulated on the bottom and introducing it into the discharge port 16a. An electric motor is connected to the screw reclaimer 16b as a drive source, and a rotational driving force is transmitted from the electric motor to rotationally drive the screw reclaimer 16b. By making the rotation speed of the screw reclaimer 16b constant, the amount of biomass discharged from the first fuel storage tank 16 is made constant.

  The first fuel transfer unit 17 constitutes a transfer path for transferring the biomass stored in the first fuel storage tank 16. The first fuel transfer unit 17 transfers or passes the biomass between the first fuel storage tank 16 and the solid fuel common transfer unit 14.

  The first fuel transport unit 17 includes a first fuel chute 18 connected to the bottom of the first fuel storage tank 16, a first fuel transport unit 19 that transports the biomass introduced through the first fuel chute 18, A first fuel chute 20 for dropping the biomass transported by the fuel transport unit 19.

  The upper end portion of the upstream first fuel chute 18 is connected to the discharge port 16 a of the first fuel storage tank 16, and the lower end portion of the first fuel chute 18 is connected to one end side of the first fuel transfer unit 19. Yes. The biomass that has dropped the first fuel chute 18 is introduced to one end of the first fuel transfer unit 19.

  The 1st fuel conveyance unit 19 is a screw conveyor, for example, and conveys biomass from the one end side to the other end side. At the bottom of the other end side of the first fuel transfer unit 19, a discharge port 19a for discharging the transferred biomass is provided. The first fuel transfer unit 19 may be, for example, a chain conveyor or another transfer unit.

  The upper end portion of the first fuel chute 20 on the downstream side is connected to the discharge port 19 a of the first fuel transfer unit 19, and the lower end portion of the first fuel chute 20 is connected to the solid fuel common transfer portion 14. The biomass that has dropped the first fuel chute 20 is introduced into the solid fuel common conveyance unit 14.

  The second fuel receiving and conveying unit 12 receives, stores and conveys PKS which is one of a plurality of types of solid fuel. PKS includes a shell after squeezing palm oil from palm palm seeds. The second fuel receiving and conveying unit 12 includes a second fuel storage tank 21 and a second fuel conveying unit 22. The solid fuel received, stored, and transported by the second fuel receiving and transporting unit 12 is not limited to PKS, and may be other solid fuel, which is the same as the solid fuel handled by the first fuel receiving and transporting unit 11. Different types of solid fuel may be used. The second fuel receiving and conveying unit 12 may receive, store, and convey a plurality of types of solid fuel.

  The second fuel storage tank 21 receives and stores PKS. A discharge port 21 a for discharging the PKS stored in the second fuel storage tank 21 is provided at the bottom of the second fuel storage tank 21. The PKS discharged from the discharge port 21 a is introduced into the second fuel transfer unit 22.

  Further, a screw reclaimer 21b is provided at the bottom of the second fuel storage tank 21 for transporting PKS deposited on the bottom and introducing it into the discharge port 21a. An electric motor is connected to the screw reclaimer 21b as a drive source, and a rotational driving force is transmitted from the electric motor to rotationally drive the screw reclaimer 21b. By making the rotation speed of the screw reclaimer 21b constant, the discharge amount of PKS discharged from the second fuel storage tank 21 is made constant.

  The second fuel transfer unit 22 constitutes a transfer path for transferring the PKS stored in the second fuel storage tank 21. The second fuel transport unit 22 transports or passes the PKS between the second fuel storage tank 21 and the solid fuel common transport unit 14.

  The second fuel transport unit 22 includes a second fuel chute 23 connected to the bottom of the second fuel storage tank 21, a second fuel transport unit 24 that transports the PKS introduced through the second fuel chute 23, And a second fuel chute 25 for dropping the PKS transported by the fuel transport unit 24.

  The upper end portion of the second fuel chute 23 on the upstream side is connected to the discharge port 21 a of the second fuel storage tank 21, and the lower end portion of the second fuel chute 23 is connected to one end side of the second fuel transfer unit 24. Yes. The PKS that has dropped the second fuel chute 23 is introduced to one end side of the second fuel transfer unit 24.

  The 2nd fuel conveyance unit 24 is a screw conveyor, for example, and conveys PKS from the one end side to the other end side. A discharge port 24 a for discharging the transported PKS is provided at the bottom of the second fuel transfer unit 24 on the other end side. The second fuel transfer unit 24 may be, for example, a chain conveyor or another transfer unit.

  The upper end portion of the second fuel chute 25 on the downstream side is connected to the discharge port 24 a of the second fuel transfer unit 24, and the lower end portion of the second fuel chute 25 is connected to the solid fuel common transfer portion 14. The PKS that has dropped the second fuel chute 25 is introduced into the solid fuel common transport unit 14.

  Further, as shown in FIGS. 3 to 5, a plurality of shelf plates 51 and 52 are provided inside the second fuel chute 25. Details of the plurality of shelf boards 51 and 52 will be described later.

  The solid fuel common transport unit 14 joins and transports the biomass and the PKS, and the solid fuel common first transport unit 32, and the solid fuel common chute 35 that drops the biomass and the PKS transported by the solid fuel common first transport unit 32. And a solid fuel common second transport unit 36 that transports the biomass and PKS introduced through the solid fuel common chute 35.

  The solid fuel common first transport unit 32 includes a first fuel introduction chute (first inflow portion) 32a for allowing biomass to flow into the transport unit, and a second fuel for flowing PKS into the transport unit. And an introduction chute (second inflow portion) 32b. The first fuel introduction chute 32a and the second fuel introduction chute 32b are ducts whose openings have a rectangular cross section, for example. The first fuel introduction chute 32 a is connected to the lower end of the first fuel chute 20, and the second fuel introduction chute 32 b is connected to the lower end of the second fuel chute 25.

  The first fuel introduction chute 32a is arranged on the upstream side which is one end side in the conveyance direction of the solid fuel common first conveyance unit 32, and the second fuel introduction chute 32b is arranged downstream of the first fuel introduction chute 32a. Has been. For example, the second fuel introduction chute 32b is disposed at an intermediate portion in the conveyance direction of the solid fuel common first conveyance unit 32.

  The solid fuel common first transport unit 32 is, for example, a chain conveyor. The solid fuel common first transport unit 32 includes a duct 32c that constitutes a biomass and PKS transport path, a plurality of flights 32d that are disposed in the duct 32c and scrape and transport the biomass and the PKS, and a plurality of flights 32d. An endless chain 32e supported at a predetermined interval and a plurality of sprockets 32f over which the endless chain 32e is stretched are provided. The first fuel introduction chute 32a and the second fuel introduction chute 32b are provided on the top plate of the duct 32c. Openings are respectively provided at positions corresponding to the first fuel introduction chute 32a and the second fuel introduction chute 32b on the top plate.

  The plurality of sprockets 32f include a driving sprocket and a driven sprocket. The drive sprocket is rotated by being connected to an electric motor (not shown) as a drive source. The driven sprocket is disposed along the orbit of the endless chain 32e, supports the endless chain 32e, and rotates in conjunction with the movement of the endless chain 32e. When the rotational driving force is transmitted from the electric motor and the driving sprocket is rotationally driven, the endless chain 32e and the flight 32d rotate along the circular path. The solid fuel common first conveyance unit 32 is a chain conveyor that is pulled down, and a flight 32d disposed on the lower side moves in the conveyance direction. The biomass that has flowed in from the first fuel introduction chute 32a on the upstream side is raked by a plurality of flights 32d and conveyed downstream, and the PKS that has flowed in from the second fuel introduction chute 32b on the downstream side is It is scraped together with the biomass and conveyed downstream.

  The bottom plate on the other end side of the duct 32c is provided with a discharge chute 32g for discharging the conveyed biomass and PKS. The biomass and PKS conveyed in the duct 32c pass through the discharge chute 32g and are introduced into the solid fuel common chute 35.

  The solid fuel common chute 35 extends in the vertical direction, and connects the solid fuel common first transport unit 32 and the solid fuel common second transport unit 36. The upper end of the solid fuel common chute 35 is connected to the discharge chute 32g of the solid fuel common first transport unit 32, and the lower end of the solid fuel common chute 35 is one end side (upper end side) of the solid fuel common second transport unit 36. )It is connected to the. The solid fuel dropped from the solid fuel common chute 35 is introduced into the solid fuel common second transport unit 36.

  The solid fuel common second transport unit 36 is, for example, a screw conveyor, and transports the solid fuel from one end side to the other end side. The other end of the solid fuel common second transport unit 36 is connected to the fuel inlet 5 a of the furnace 5. The duct 36a and the transport screw 36b of the solid fuel common second transport unit 36 are disposed to be inclined with respect to the horizontal direction. The duct 36a and the conveying screw 36b are disposed downward from the upstream side toward the downstream side. The solid fuel common second transport unit 36 may be, for example, a chain conveyor or another transport unit.

  The solid fuel transported by the solid fuel common second transport unit 36 is supplied into the furnace 5 through the fuel inlet 5a.

  Next, with reference to FIGS. 3 to 5, a plurality of shelf plates 51 and 52 provided inside the second fuel chute 25 and the second fuel introduction chute 32b will be described. 3 to 5, three orthogonal directions are illustrated as X, Y, and Z directions. The X direction is the transport direction in the solid fuel common first transport unit 32, the Y direction is the width direction orthogonal to the transport direction of the solid fuel common first transport unit 32, and the Z direction is the vertical direction.

  As shown in FIG. 3, the plurality of shelf plates 51 and 52 are installed inside the second fuel chute 25 and the second fuel introduction chute 32b that constitute the conveyance path in which the PKS falls, and the one of the falling PKSs. The part is deposited. 3 and 5 show a state in which PKS is deposited on the plurality of shelf boards 51 and 52.

  As shown in FIG. 4, the second fuel chute 25 and the second fuel introduction chute 32 b that constitute the transport path on which the PKS falls are, as shown in FIG. 4, a pair of wall bodies 53 that face the X direction and extend in the Z direction, 54, and a pair of wall bodies 55 and 56 facing the Y direction and extending in the Z direction. An area surrounded by these wall bodies 53 to 56 is a conveyance path on which the PKS falls.

  The plurality of shelf boards 51 and 52 are arranged so as to protrude from the wall bodies 53 and 54 facing in the X direction, respectively. A shelf board (first shelf board) 51 projects from one wall body 53, and a shelf board (second shelf board) 52 projects from the other wall body 54. The shelf board 51 is arranged on one side in the X direction, and the shelf board 52 is arranged on the other side in the X direction.

  The plurality of shelf boards 51 and 52 are arranged at predetermined intervals over the entire length of the second fuel chute 25 and the second fuel introduction chute 32b in the Z direction. The shelf boards 51 and the shelf boards 52 are alternately arranged in the vertical direction.

As shown in FIG. 4, when viewed from the Z direction, the shelf plates 51 and 52 each have a half size of the entire area of the opening 40 of the second fuel chute 25 and the second fuel introduction chute 32b. It is made. The opening 40 is a rectangular opening of the second fuel chute 25 or a rectangular opening of the second fuel introduction chute 32b. The opening 40 is a space surrounded by a pair of wall bodies 53 and 54 facing the X direction and extending in the Z direction, and a pair of wall bodies 55 and 56 facing the Y direction and extending in the Z direction. is there. Incidentally, the straight line L1 shown in FIG. 4, in the X direction, through the center of the opening 40, the opening width D ₀ in the X direction of the opening 40 is a straight line extending in the Y direction, the wall 53 and the wall It is the distance between the body 54.

The shelf board 51 is disposed so as to cover the opening area (first opening area) 41 between the straight line L <b> 1 and the wall body 53 in the opening section 40 from below, and the shelf board 52 is disposed in the opening section 40. The opening region (second opening region) 42 between the straight line L1 and the wall body 54 is disposed so as to cover from below. The opening width D ₁ in the X direction of the opening region 41 is equal to the opening width D ₂ in the X direction of the opening region 42. Further, in the X direction, the overhang length from wall 53 of the shelf board 51, corresponding to the opening width D _1, the projecting length from the wall 54 of the shelf board 52, corresponding to the opening width D ₂ Yes. When viewed from the Z direction, the opening area 41 adjacent to the shelf board 52 is covered with the shelf board 51, and the opening area 42 adjacent to the shelf board 51 is covered with the shelf board 52. When viewed from the Z direction, the shelf board 51 and the shelf board 52 cover the entire area of the opening 40.

  Further, as shown in FIG. 5, weirs 57 projecting upward are provided at the tip portions 51a and 52a of the shelf boards 51 and 52, respectively. The front end 51 a of the shelf board 51 is an end adjacent to the opening area 42, and the front end 52 a of the shelf 52 is an end adjacent to the opening area 41. The weir 57 is formed in the front-end | tip parts 51a and 52a over the full length of the shelf boards 51 and 52 in a Y direction. The weir 57 protrudes from the top surfaces 51b and 52b of the shelf boards 51 and 52, for example, by 25 mm. The weir 57 forms a storage part capable of storing PKS on the top surfaces 51b and 52b of the shelf boards 51 and 52. The storage part on the shelf board 51 is an area surrounded by the top surface 51 b of the shelf board 51, the wall bodies 53, 55, 56, and the weir 57, and the storage part on the shelf board 52 is the top part of the shelf board 52. This is an area surrounded by the surface 52 b and the wall bodies 54, 55, and 56. By providing such a weir 57, PKS is reliably deposited on the shelf boards 51 and 52. The PKS deposited on the shelf boards 51 and 52 forms a repose angle θ.

  Next, the attachment structure of the shelf boards 51 and 52 is demonstrated. Support pieces 58a and ribs 58b are provided on the bottom surfaces 51c and 52c of the shelf boards 51 and 52, respectively. In FIG. 3, the support pieces 58a and the ribs 58b are not shown. The support piece 58a has a plate shape, is arranged so that the thickness direction is along the X direction, and is formed so as to protrude downward from the bottom surfaces 51c and 52c of the shelf boards 51 and 52. The support piece 58a extends in the Y direction, and the length in the Y direction corresponds to the length of the shelf plates 51 and 52 in the Y direction. The support piece 58a is joined to the shelf boards 51 and 52 by welding, for example. The support piece 57 a provided on the shelf board 51 contacts the wall body 53, and the support piece 58 a provided on the shelf board 52 contacts the wall body 54. The support piece 58a is provided with a bolt hole (not shown).

  The ribs 57b have a plate shape, are arranged so that the thickness direction is along the Y direction, and are formed so as to protrude downward from the bottom surfaces 51c and 52c of the shelf boards 51 and 52. The ribs 58b are arranged so as to be orthogonal to the shelf boards 51 and 52 and the support piece 58a. The ribs 58b are arranged, for example, along the X direction at the center in the Y direction. The rib 58b projects from the support piece 58a in the X direction and extends to the front ends of the shelf boards 51 and 52. The rib 58b is joined to the shelf boards 51 and 52 and the rib 58b by welding, for example. The ribs 58b support the shelf boards 51 and 52 from below and prevent the shelf boards 51 and 52 from being deformed.

  In the shelf plates 51 and 52, the support pieces 58a are fixed to the opposing wall bodies 53 and 54 by bolts (not shown) inserted through the bolt holes of the support pieces 58a. The shelf boards 51 and 52 are detachably attached to the wall bodies 53 and 54, respectively. The shelf boards 51 and 52 may be attached to the wall bodies 55 and 56 facing in the Y direction. Moreover, the shelf boards 51 and 52 may be joined to the wall bodies 53 and 54 by welding etc., for example.

  Next, with reference to FIG. 5, the space | interval in the Z direction (up-down direction) of the some shelf boards 51 and 52 is demonstrated. The intervals in the Z direction of the plurality of shelf boards 51 and 52 are determined in consideration of, for example, the cell flying 60 that is PKS deposited on the shelf boards 51 and 52. When the PKS falls from above, the PKS accumulates on the shelf plates 51 and 52 as shown in FIG. 5, and the inclined surface 60a is inclined at the repose angle θ with respect to the top surfaces 51b and 52b of the shelf plates 51 and 52. A cell flying 60 is formed.

For example, the distance _{D 3} between the inclined surface 60a and the shelf plate 51 of the self-lining 60 formed on the shelf plate 52 has a opening width _{D 2} or more open region 42 adjacent the shelf board 51 _{(D 3} ≧ D _2). The distance _{D 3} is the distance in the direction orthogonal to the inclined surface 60a.

In this case, the bottom surface 51c of the shelf plate 51 in the Z direction, the distance between the top surface 52b of the shelf plate 52 and the height _{H 0,} of the weir 57 the top surface (shelf 52 of the self-lining 60 of the distal end portion 52a side the distance between the bottom surface 51c of the apex) and the shelf plate 51 and the height _{H 1,} when the height _{H 57} of the height of the weir 57, the following equation (1) is satisfied.
H ₀ = H ₁ + H ₅₇ (1)

The height H ₁ can be expressed by the following equation (2) using the distance D ₃ and the angle of repose θ.
H ₁ = D ₃ / COSθ (2)
Then, when Expression (2) is substituted into Expression (1), the following Expression (3) is established.
H ₀ = D ₃ / COSθ + H ₅₇ (3)
Therefore, the space | interval with the shelf 51 and the shelf 52 can be calculated using Formula (3).
The distance between the shelf plate 52 disposed above the shelf plate 51 and the shelf plate 51 can also be calculated using the equation (3).

The repose angle θ can be obtained by depositing PKS on the shelf plates 51 and 52 to form the cell flying 60 and measuring the slope 60 a of the cell flying 60. The height _{H 1} is preferably about 1.5 times the opening width _{D 2.} When the height H ₁ is about 1.5 times the opening width D ₂ , it is possible to prevent clogging of the falling solid fuel and to prevent the second fuel chute 25 from being strengthened and to be appropriate. It can be a size.

  Next, the operation of the fuel supply facility 3 of the fluidized bed combustion facility 1 will be described.

  Biomass stored in the first fuel storage tank 16 is introduced into the first fuel chute 18. The biomass that has passed through the first fuel chute 18 is supplied to the first fuel transfer unit 19. The biomass supplied to the first fuel transfer unit 19 is transferred so that the transfer amount per unit time is constant, passes through the first fuel chute 20, and is supplied to the solid fuel common first transfer unit 32.

  The PKS stored in the second fuel storage tank 21 is introduced into the second fuel chute 23. The PKS that has passed through the second fuel chute 23 is supplied to the second fuel transfer unit 24. The PKS supplied to the second fuel transfer unit 24 is transferred so that the transfer amount per unit time is constant, passes through the second fuel chute 25, and is supplied to the solid fuel common first transfer unit 32.

  In the solid fuel common first transport unit 32, biomass is introduced from the first fuel introduction chute 32a on the upstream side, and PKS is introduced from the second fuel introduction chute 32b downstream from the first fuel introduction chute 32a. The biomass introduced to the upstream side is conveyed downstream by the solid fuel common first conveyance unit 32, and merges with the PKS introduced from the second fuel introduction chute 32b. In the downstream of the second fuel introduction chute 32b, the biomass is conveyed together with the PKS. Biomass and PKS are transported by the solid fuel common first transport unit 32 and supplied to the solid fuel common chute 35.

  The biomass and PKS that have passed through the solid fuel common chute 35 are supplied to the solid fuel common second transport unit 36. The biomass and the PKS introduced into the solid fuel common second transport unit 36 are transported so that the transport amount per unit time is constant, and are supplied into the furnace 5 through the fuel inlet 5a.

  In such a fuel supply facility 3, since the plurality of shelf plates 51 and 52 are provided inside the second fuel chute 25 and the second fuel introduction chute 32b, the PKS falling from above is the shelf plates 51 and 52. Deposit on top. As a result, the cell flying 60 is formed on the shelf boards 51 and 52. Then, the PKS falling from above hits the slope 60 a of the cell flying 60 on the shelf plate 51 and is decelerated. The PKS hitting the slope 60 a passes through the opening area 42 adjacent to the shelf board 51. The PKS that has dropped through the opening region 42 hits the slope 60 a of the cell flying 60 on the shelf plate 52 and is decelerated. The PKS hitting the inclined surface 60a passes through the opening region 41 adjacent to the shelf plate 52 and falls further downward. In this way, the PKS decelerates by hitting the inclined surface 60a of the cell flying 60, passes through the opening regions 42 and 41 in order, passes through the second fuel chute 25 and the second fuel introduction chute 32b, and increases in speed. The solid fuel common first conveyance unit 32 is suppressed.

  Therefore, the wear of the wall bodies 53 to 56 and the solid fuel common first transport unit 32 constituting the transport path can be suppressed. Specifically, in the solid fuel common first transport unit 32, wear of the walls of the flight 32d and the duct 32c is reduced.

  Moreover, since the impact which PKS receives is relieve | moderated because the fall speed of PKS is decelerated, damage to PKS is suppressed. Moreover, since PKS accumulates on the shelf boards 51 and 52 and the cell flying 60 which covers the top surfaces 51b and 52b of the shelf boards 51 and 52 is formed, the PKS falling from above is placed on the shelf boards 51 and 52. A direct hit is prevented. Therefore, wear of the shelf boards 51 and 52 is suppressed. Further, the falling PKS hits the PKS functioning as the cell flying 60, so that damage to the PKS itself is suppressed.

  Further, when viewed from above, the shelf board 51 is disposed so as to cover the entire opening area 41 adjacent to the shelf board 52 from below, and the shelf board 52 is disposed on the entire opening area 42 adjacent to the shelf board 51. Is arranged so as to cover from below. As a result, the PKS that falls upward or falls will hit at least one of the cell flying 60 formed on the shelf plate 51 and the cell flying 60 formed on the shelf plate 52, and will be surely decelerated. Become. In other words, the PKS passes through the second fuel chute 25 and the second fuel introduction chute 32b without hitting the cell flying 60 formed on the shelf plate 51 or the cell flying 60 formed on the shelf plate 52. Is prevented. Thereby, the fall speed of PKS can be decelerated reliably and the wear of the wall bodies 53-56 and the solid fuel common 1st conveyance unit 32 which comprise a conveyance path | route can be suppressed reliably.

In the second fuel chutes 25 and the second fuel introduction chute 32b, the self-lining 60 on the shelves 52, the distance D ₃ between the shelf plate 51 in its upward, open the aperture region 42 adjacent the shelf board 51 and it has a width _{D 2} or more. Similarly, the distance between the cell flying 60 on the shelf 51 and the shelf 52 above it is equal to or greater than the opening width D ₁ of the opening region 41 adjacent to the shelf 52. Thereby, in the full length of the 2nd fuel chute 25 and the 2nd fuel introduction chute 32b, opening width is ensured reliably, a possibility that PKS may be clogged is reduced, and PKS can be flowed reliably.

  The present invention is not limited to the above-described embodiments, and various modifications as described below are possible without departing from the gist of the present invention.

  Although the said embodiment demonstrated the structure by which the shelf boards 51 and 52 are installed over the full length of the 2nd fuel chute 25 and the 2nd fuel introduction chute 32b, the shelf boards 51 and 52 are the up-down direction. May be partially installed. For example, it may be provided only on the second fuel introduction chute 32b, may be provided only on the second fuel chute 25, or may be provided only on the lower end side of the second fuel chute 25.

  Further, the shelf plates 51 and 52 may be provided on the second fuel chute 23. Further, the shelf boards 51 and 52 may be provided on the solid fuel common chute 35. Further, the shelf plates 51 and 52 may be provided on the first fuel chutes 18 and 20 and the first fuel introduction chute 32a.

  Moreover, in the said embodiment, although the shelf boards 51 and 52 which protrude in the X direction from the wall bodies 53 and 54 are demonstrated, the shelf boards 51 and 52 are extended in the Y direction from the wall bodies 55 and 56. It may be installed, or it may protrude in other directions. Further, the shelf boards 51 and 52 may be arranged at a predetermined inclination angle with respect to the XY plane. In short, it is sufficient that the solid fuel can be deposited on the shelf boards 51 and 52. Moreover, you may deposit other things on the shelf boards 51 and 52 in advance.

  Moreover, the shape of the shelf boards 51 and 52 is not limited to a rectangular shape, For example, a triangle may be sufficient, a trapezoid may be sufficient, and a semicircle shape may be sufficient. For example, when the cross-sectional shape of the conveyance path is circular, other shapes such as a semicircular shape and a fan shape may be used. Moreover, in the said embodiment, when it sees from upper direction, although the shelf boards 51 and 52 are each arrange | positioned in the opening area | region into which the opening part was divided into two, the opening area into which the opening part was divided | segmented into three or more Moreover, the structure by which the some shelf board is arrange | positioned may be sufficient.

  Moreover, in the said embodiment, although the shelf boards 51 and 52 are arrange | positioned so that the whole area of an opening part may be covered from the downward direction, an opening part is block | closed partially by the several shelf boards 51 and 52. But you can. Moreover, the shelf boards 51 and 52 are not limited to what is comprised by one board, A plurality of shelf boards may be comprised by being arranged in the direction orthogonal to a plate | board thickness direction, The shelf board may be configured to be stacked in the thickness direction.

  Moreover, the conveyance path | route in which solid fuel falls and the shelf boards 51 and 52 are installed is not limited to the case where it extends in a perpendicular direction, The shelf boards 51 and 52 are provided in the conveyance path | route inclined with respect to a perpendicular direction. May be installed.

  In the above embodiment, the fuel supply facility 3 collects a plurality of types of solid fuel and puts them into the furnace 5. However, a plurality of types of solid fuel may be conveyed separately. Further, the present invention may be applied to the fuel supply facility 3 that supplies only a single solid fuel to the furnace 5.

  Moreover, in the said embodiment, although the circulating fluidized bed boiler is illustrated as a combustion furnace, another boiler may be sufficient and a waste incinerator etc. may be sufficient.

  In the above-described embodiment, the second fuel receiving and conveying unit 12 includes a screw reclaimer inside the second fuel storage tank 21, but a screw reclaimer 21 b is provided inside the second fuel storage tank 21. The structure which is not necessary may be sufficient. For example, instead of the screw reclaimer 21b, as shown in FIG. 6, it may be configured to include transport units 62, 62B, 62C arranged outside the second fuel storage tanks 61, 61B. Further, the second fuel transfer unit may be configured not to include the second fuel chute 23.

  For example, the second fuel receiving and conveying unit may be configured to include a second fuel storage tank 61 and a conveying unit 62 as shown in FIG. The second fuel storage tank 61 is, for example, a hopper, and the solid fuel discharged from the bottom discharge port is supplied to the transport unit 62.

  The transport unit 62 includes a belt conveyor 62a and a chain conveyor 62b. In the transport unit 62, a belt conveyor 62a is disposed on the upper stage, and a chain conveyor 62b is disposed on the lower stage. The solid fuel supplied from the second fuel storage tank 61 is supplied to the belt conveyor 62a and conveyed. The chain conveyor 62b conveys the solid fuel (powder) dropped from the belt conveyor 62a inside the duct. The solid fuel transported by the transport unit 62 is introduced into the second fuel transport unit 24.

  Moreover, the structure provided with the conveyance unit 62B which is a screw conveyor may be sufficient as a 2nd fuel receiving conveyance part, as FIG.6 (b) shows. Further, the second fuel storage tank 61B has a plurality of discharge ports. This discharge port is arrange | positioned forward and backward in the conveyance direction of the conveyance unit 62B. Further, as shown in FIG. 6C, the second fuel receiving and conveying unit may be configured to include a conveying unit 62C that is a chain conveyor. Further, the first fuel receiving / conveying unit may include the second fuel storage tanks 61, 61B and the conveying units 62, 62B, 62C.

  DESCRIPTION OF SYMBOLS 1 ... Fluidized bed combustion equipment, 2 ... Circulating fluidized bed boiler (combustion furnace), 3 ... Fuel supply equipment (conveyance apparatus), 25 ... 2nd fuel chute (conveyance path), 32 ... Solid fuel common 1st conveyance unit ( Conveying device), 32b ... second fuel introduction chute (conveying path), 40 ... opening, 41 ... opening area (opening adjacent to the second shelf), 42 ... opening area (adjacent to the first shelf) , 51 ... shelf board (first shelf board), 52 ... shelf board (second shelf board), 57 ... weir.

Claims (4)

A transport device having a transport path for transporting solid fuel to be fed into a combustion furnace,
Provided with a plurality of shelf plates in the transport path where the solid fuel falls,
The plurality of shelf boards are:
A first shelf arranged above the plurality of shelf plates;
A second shelf arranged below the first shelf,
The second shelf board is a transfer device that is disposed at a position that covers the opening adjacent to the first shelf board from below when viewed from above.   2. The transport device according to claim 1, wherein the second shelf board is disposed at a position that covers the entire surface of the opening adjacent to the first shelf board from below when viewed from above.   The distance between the solid fuel deposited on the second shelf and the first shelf is equal to or greater than the opening width of the opening adjacent to the first shelf. 2. The transfer apparatus according to 2. The first shelf is provided with a weir that protrudes upward at an end of the opening adjacent to the first shelf.
The said 2nd shelf board is provided with the weir which protrudes upwards in the edge part by the side of the said opening part adjacent to the said 2nd shelf board. Conveying device.

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